Though these two syndromes are not thought to be autoimmune in nature, it's interesting that many of the medications used to treat fibromyalgia suppress the immune system. Chronic infections may play a role in both so suppressing the immune system seems counterproductive.

As far as we know, they are not autoimmune syndromes.

In brief:
Interesting question

Though these two syndromes are not thought to be autoimmune in nature, it's interesting that many of the medications used to treat fibromyalgia suppress the immune system. Chronic infections may play a role in both so suppressing the immune system seems counterproductive.

As far as we know, they are not autoimmune syndromes.
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Both fibromyalgia and chronic fatigue syndromes are related, but neither condition is autoimmune.

Fibromyalgia involves widespread pain in defined tender areas above and below the waist and on both the left and right sides of the body, accompanied by fatigue; the cause is unknown. Chronic fatigue syndrome, however, is not characterized by pain, and there are some known causes. Treatments differ.

In brief:
Yes and no

Both fibromyalgia and chronic fatigue syndromes are related, but neither condition is autoimmune.

Fibromyalgia involves widespread pain in defined tender areas above and below the waist and on both the left and right sides of the body, accompanied by fatigue; the cause is unknown. Chronic fatigue syndrome, however, is not characterized by pain, and there are some known causes. Treatments differ.
Would you like to video or text chat with me?